Knowing damn well they can't hit the sour
They're new booties, they probably need baby powder

from Kendrick Lamar – H.O.C. Lyrics on Rap Genius

Meaning

They can brag all they want but they can never hit anything as potent as Sour Diesel, the strain of weed Kendrick is referring to.

“New booties” is slang that refers to someone who’s a rookie (baby), hence the need for baby powder.

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